Raman Sped

Question 1

What happens in Raman spec

Answer 1

Light from an incident laser source is inelastically scattered and shows up as a shift in frequency.
The energy associated with this shift of frewucny is that of a molecular vibration.

Question 2

What is elastic scattering

Answer 2

An amount of energy hits a sample and Bounces off. There is no interaction byeeeen matter and photon.

Question 3

What is a inleasttic scattering

Answer 3

Energy hits sample and sample uses soem fo the energy to do a molecular vibration , the energy associated with it changes . The wavelength therefore changes as some of the energy has been used to set the molecule into vibstyion mode.

Question 4

What is on the spectrum

Answer 4

Intensity v wavelength differnce

Question 5

Dif fence between ir and Raman

Answer 5

Light hitting sample in Raman is much higher In energy and on,y some of the energy is absorbed

Question 6

Advantages of Raman over ir

Answer 6

Minimal sample prep

Very general - Can be applied on a lot of materials

Rich in information

Aqueous samples can be easily used.

Question 7

Disadvantages of Raman over ir

Answer 7

Effect is weak - v sensitive detectors needed - expensive.

Interference from fluorescence - can swamp Raman signal